Central Park Overly Green!

There's a long post on the National Weather Service at Upton, NY's website about why the Central Park readings were lower than those in the rest of the City during the run of 100+ degree days we had recently. One might immediately suspect broken equipment, which maybe loses its sensitivity in high temperatures, and this was an effort to dispel such suspicions. But the use of the phrase 'overly green' was, I thought, funny.

CURRENTLY, WE BELIEVE THAT THE WET SPRING AND OVERLY GREEN
CONDITIONS IN CENTRAL PARK ARE CONTRIBUTING TO THE SLIGHTLY COOLER
READINGS WE HAVE SEEN IN THE PARK DURING THIS RECENT HEAT WAVE. THE
BACKUP TEMPERATURE GAGE IS TOTALLY IN LINE WITH OUR ASOS TEMPERATURE
EQUIPMENT WHICH WAS RECALIBRATED JUST BEFORE THIS RECENT HEAT WAVE
BEGAN, SO THERE IS NO QUESTION THAT THE READINGS ARE CORRECT.

Is this some attempt by the liberazzi at the NWS to suggest that there's more carbon dioxide in the air?